In the 1990 case of International Primate Protection League and its Members, et al. v. Administrators of Tulane Educational Fund et al., the U.S Supreme Court addressed a dispute over animal rights and research ethics. The International Primate Protection League (IPPL) sued Tulane University for alleged violations of the Animal Welfare Act in their use of primates for biomedical research. IPPL claimed that Tulane's treatment was cruel and harmful to animals, thus violating federal law which requires humane handling, care, treatment, and transportation of animals used in experiments. However, the court ruled against IPPL stating that private individuals or organizations do not have standing to sue under this act as it does not explicitly provide a right to sue for those who believe they are injured by violation of its provisions; only government officials can enforce these laws through penalties or revocation/suspension licenses if necessary after investigations into complaints about non-compliance with regulations.

In the dissenting opinion for International Primate Protection League v. Administrators of Tulane Educational Fund, it was argued that the majority's decision to deny standing to the plaintiffs undermined their ability to challenge actions they believed were harmful to animals and contrary to federal law. The dissent contended that by requiring a direct injury or imminent threat thereof, the court effectively barred animal rights organizations from seeking judicial review of government decisions related to animal welfare unless they could demonstrate personal harm. This interpretation, according to the dissenters, ignored Congress' intent in passing laws like Endangered Species Act and Animal Welfare Act which aimed at protecting animals from abuse and exploitation even when such acts do not directly affect humans. They also criticized majority's narrow view on 'zone of interests', arguing that these organizations fall within this zone as they are dedicated towards protection of primates - an interest clearly protected by relevant statutes.